// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_PEPPER_PEPPER_FILE_SYSTEM_HOST_H_
#define CONTENT_RENDERER_PEPPER_PEPPER_FILE_SYSTEM_HOST_H_

#include <stdint.h>

#include <string>

#include "base/files/file.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "ppapi/c/pp_file_info.h"
#include "ppapi/c/private/ppb_isolated_file_system_private.h"
#include "ppapi/host/host_message_context.h"
#include "ppapi/host/resource_host.h"
#include "url/gurl.h"

namespace content {

class RendererPpapiHost;

class PepperFileSystemHost
    : public ppapi::host::ResourceHost,
      public base::SupportsWeakPtr<PepperFileSystemHost> {
public:
    // Creates a new PepperFileSystemHost for a file system of a given |type|. The
    // host will not be connected to any specific file system, and will need to
    // subsequently be opened before use.
    PepperFileSystemHost(RendererPpapiHost* host,
        PP_Instance instance,
        PP_Resource resource,
        PP_FileSystemType type);
    // Creates a new PepperFileSystemHost with an existing file system at the
    // given |root_url| and of the given |type|. The file system must already be
    // opened. Once created, the PepperFileSystemHost is already opened for use.
    PepperFileSystemHost(RendererPpapiHost* host,
        PP_Instance instance,
        PP_Resource resource,
        const GURL& root_url,
        PP_FileSystemType type);
    ~PepperFileSystemHost() override;

    // ppapi::host::ResourceHost override.
    int32_t OnResourceMessageReceived(
        const IPC::Message& msg,
        ppapi::host::HostMessageContext* context) override;
    bool IsFileSystemHost() override;

    // Supports FileRefs direct access on the host side.
    PP_FileSystemType GetType() const { return type_; }
    bool IsOpened() const { return opened_; }
    GURL GetRootUrl() const { return root_url_; }

private:
    // Callback for OpenFileSystem.
    void DidOpenFileSystem(const std::string& name_unused, const GURL& root);
    void DidFailOpenFileSystem(base::File::Error error);

    int32_t OnHostMsgOpen(ppapi::host::HostMessageContext* context,
        int64_t expected_size);
    int32_t OnHostMsgInitIsolatedFileSystem(
        ppapi::host::HostMessageContext* context,
        const std::string& fsid,
        PP_IsolatedFileSystemType_Private type);

    RendererPpapiHost* renderer_ppapi_host_;
    ppapi::host::ReplyMessageContext reply_context_;

    PP_FileSystemType type_;
    bool opened_; // whether open is successful.
    GURL root_url_;
    bool called_open_; // whether open has been called.

    base::WeakPtrFactory<PepperFileSystemHost> weak_factory_;

    DISALLOW_COPY_AND_ASSIGN(PepperFileSystemHost);
};

} // namespace content

#endif // CONTENT_RENDERER_PEPPER_PEPPER_FILE_SYSTEM_HOST_H_
